Half to john b



(NoModeL) J. P. YOUNG.

TELEPHONE TRANSMITTER, 7 No. 345,658. Patented July 13, 1886.

Fig.1.

W|TNE$SESI I INVENTORI j. 2% W6 UNITED STATES PATENT OFFICE.

JAMES P. YOUNG, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE- HALF TOJOHN B. DALLAS, OF SAME PLACE.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 345,658, dated July 13,1886. Application filed October 24, 1884. Serial No. 146,349. (Nomodel.)

To all whom it may concern.-

Be it known that I, J AMES P. YOUNG, a citizen of the United States,residing in the city and county of Philadelphia, State of Penn sylvania,have invented a new and useful Improvement in TelephoneTransmitters,which improvement is fully set forth in the following specification andaccompanying drawings, in which- Figure 1 represents a View; of theinterior of a microphone embodying my invention. Fig. 2 represents asection of a portion of the microphone in line .00 00, Fig. 1.

Similar letters of reference indicate corresponding parts in the'twofigures.

My invention consists of a microphone having means whereby the contactof the electrodes may be maintained and nicely adjusted when necessary.

Referring to the drawings, A represents a box or casing of a microphone,and B the dia phragm thereof.

Suitably attached to the diaphragm B is the electrode 0, having the wireD conducting to the inductioncoil E.

Tothe casing A is attached a bracket, F, which has two arms, F F,extending therefrom, between which is suspended, by means ofscrews G, ametallic oscillating arm, H, (shown T- shaped,) said screws beingprovided with jam-nuts J.

K represents the vertical part of the arm H, the same having a circularplate, L, to which is secured an electrode, M.

Rigidly secured to and projecting downward from the top part, H, of thearm H are threaded rods N N, having blocks or weights 0 0 adjustablethereon. These rods are at equal distances from part K and parallelthereto.

P represents a threaded rod, which extends horizontally from and at aright angle to the part H of the arm H, and carries a block or weight,Q, adjustable thereon.

It will be seen that owing to the rods N, N, and P, with their weights0, O, and Q, the oscillating arm H may be so regulated, first, by

the weights 0 O, which may be set nearer to or farther from the axis ofthe arm H, so as to render the latter as sensitive as possible, and nextby the weight Q, whereby a delicate contact of the electrodes may bemaintained,

and thus a low-speaking telephone is produced, it being noticed that therods or arms N N are on opposite sides of the arm H, which carries theelectrode M, each of the said arms N N having its own adjustment, sothat said electrode may be set with precision on the electrode 0, theweights of said rods NN permitting more or less strain to be imparted toeither side of the electrode M.

Attached to the mouth-piece of the tele phone or the wall of the openingthereof corresponding to said piece is a resonator, R, which consists ofa double conical tube, or is formed of two truncated cones, a a, unitedat their narrow diameter. By this provision the sound is gathered by theouter cone, a, and then passed into the wider cone, a, where thesoundwaves expand, after which said waves are gathered by the conicalopening in the' door of the transmitter, and thus directed against thediaphragm,increasing the volume ofsound transmitted, said cone beingformed of thin metal, or other suitable material which vibrates freely,and thus increases the resonant power of said cone.

I aware that it is not new to suspend electrodes from the frame of atransmitter; neither is it new to connect with the said electrodesdevices for adjusting or regulating the contact of the same, and such Ido not claim.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

A microphone composed of the casing A, having a bracket, F, with arms FF secured thereto, the oscillating arm H, pivotally secured to said armsby screws G G, and having a pending portion, K, provided with a circularplate, L, having a recess adapted to receive an electrode, and arms N N,with adj ustable weights thereon, the said arms being equally distantfrom and parallel with the the plate L, and the diaphragm 13, secured tosaid casing A, and having the electrode 0, all said parts being combinedand arranged substantially as and for the purpose set forth.

JAMES P. YOUNG.

- \Vitnesses:

J OHN 'A. WIEDERsHEIM,

J ivo. K. PLITT.

pending portion K, the electrode M, held in-

